2. Ability to change any lessonClicking on any lesson in the right panel now allows you to change this lesson:

This allows A->B->C exchanges.

3. Email and SMS notification.It is now possible to publish the substitutions on the internet easily with one button click. This service is hosted by aSc so it doesn't require any web design knowledge:

Also right after the publishing the software provides you the ability to send email or SMS messages to the teachers to notify them on the substitutions they have to make.